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JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

  • question_answer
    Permanent hardness in water cannot be cured by : JEE Main Online Paper (Held On 10 April 2015)

    A)  Ion exchange method

    B)  Treatment with washing soda

    C)  Boiling

    D)  Calgon's method

    Correct Answer: C

    Solution :

                     Only temporary hardness which is due to \[HCO_{3}^{-}\]  (Bicarbonate) ions is removed by Boiling.


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